Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Domain Bacteria Woese et al. 2024
             Kingdom Pseudomonadati (Gibbons and Murray 1978) Oren and Göker 2024
               Phylum Deferribacterota Garrity and Holt 2021 [monotypic]
                 Class Deferribacteresᵀ Huber and Stetter 2002 [monotypic]
                   Order Deferribacteralesᵀ Huber and Stetter 2002
                     Family Deferribacteraceaeᵀ Huber and Stetter 2002
                       1 Genus Calditerrivibrio Iino et al. 2008 [monotypic]
                       2 Genus Deferribacterᵀ Greene et al. 1997
                       3 Genus Flexistipes Fiala et al. 2000 [monotypic]
                       4 Genus Mucispirillum Robertson et al. 2005 [monotypic]
                       5 Genus Petrothermobacter Tamazawa et al. 2017